Have you pulled the existing unit and gotten the dimensions? It's hard to tell from the pics, but it looks a bit narrower than a standard DIN HU.

More than likely you are not going to find a drop-in. But if you check the size, you might find either the WRX kit that has been shown or i've heard about another (Infinity?) kit that may give you something where you have to do minimal custom work.

For example, in my case I need to fit ~ 3/8" of plastic on either side, cut 2 slots in my dash, and shave 1/4" off my trim piece. Not perfect, but much better than trying to fab my own housing.

You are going to have to do some custom work. Both the G35 and WRX options use 7" screens which are about a 1/2" too narrow and appear to be about 2" too short. You might look into an 8" or larger as (assuming they fit) will leave you less space you have to fab a filler for.

I bought the Double-DIN chassis some months ago, the manufacturer states that it's designed for a Subaru WRX but it's relatively easy to adapt it to other vehicles, as I did with my '03 Nissan X-Trail.

The instalation process can be seen here, be sure to visit babelfish since my Blog is in spanish.